American coach Terrence Mahon will leave his post with the British athletics federation and return home to the United States later this year, British Athletics has announced.

Last fall, Mahon, then the head coach of the Mammoth Track Club in California, accepted a position as lead endurance coach with British Athletics. When Mahon moved to England, three now-former Mammoth Track Club athletes went with him: Morgan Uceny, a 2012 Olympian at 1500 meters; Anna Willard, a 2008 Olympian in the steeplechase; and Jen Rhines (seen above with Mahon), a three-time Olympian who is Mahon's wife.

In announcing Mahon's departure, British Athletics performance director Neil Black said, “Terrence has worked hard in what has been a challenging post-2012 year to align our endurance programs going forward towards 2016 and 2017, and I thank him for his contribution to British Athletics this year. We have some exciting plans for our endurance program, including some key opportunities for our homegrown coaches going forwards, and I look forward to outlining these plans very soon.”

Mahon's move to the U.K. coincided with Deena Kastor and her husband, Andrew, assuming leadership of the Mammoth Track Club, and the club evolving into more of a community- and developing-runner-based outfit. At one point during Mahon's leadership, the Mammoth Track Club was arguably the strongest American training group; in addition to the runners named above, it included Olympic medalist Meb Keflezighi, two-time Olympian Ryan Hall, 2012 Olympian Amy Hastings, and 2008 Olympian Ian Dobson, among others.

As it turns out, Mahon is back on his native East Coast this weekend, accompanying Uceny to Sunday's Fifth Avenue Mile in New York City. Mahon has not announced where and in what capacity he'll work upon his full-time return to the United States.